DE102005041741A1 - Method for producing a press-hardened component - Google Patents
Method for producing a press-hardened component Download PDFInfo
- Publication number
- DE102005041741A1 DE102005041741A1 DE200510041741 DE102005041741A DE102005041741A1 DE 102005041741 A1 DE102005041741 A1 DE 102005041741A1 DE 200510041741 DE200510041741 DE 200510041741 DE 102005041741 A DE102005041741 A DE 102005041741A DE 102005041741 A1 DE102005041741 A1 DE 102005041741A1
- Authority
- DE
- Germany
- Prior art keywords
- press
- component
- forming
- hot
- speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Die Erfindung betrifft ein Verfahren zum Herstellen eines pressgehärteten Bauteils aus einem Halbzeug aus ungehärtetem, warm umformbaren Stahlblech, wobei das Halbzeug erwärmt und in einem Warmumformwerkzeug pressgehärtet wird. Um die beim Presshärten erreichtbaren Ziehtiefen zu erhöhen, wird erfindungsgemäß vorgeschlagen, dass die Umformgeschwindigkeit, mit welcher das Halbzeug im Warmumformwerkzeug umgeformt wird, so hoch ist, dass der Umwandlungsprozess von einem austenitischen in ein martensitisches oder bainitisches Gefüge erst nach Beendigung des Umformvorgangs abgeschlossen ist. Weiterhin betrifft die Erfindung ein nach diesem Verfahren hergestelltes Bauteil.The invention relates to a method for producing a press-hardened component from a semifinished product of uncured, hot-formable steel sheet, wherein the semifinished product is heated and press-cured in a hot-forming tool. In order to increase the draw depths which can be achieved during press-hardening, it is proposed according to the invention that the forming speed with which the semifinished product is formed in the hot-forming tool is so high that the conversion process from an austenitic to a martensitic or bainitic structure is completed only after the forming process has been completed. Furthermore, the invention relates to a component produced by this method.
Description
Die Erfindung betrifft ein Verfahren zum Herstellen eines pressgehärteten Bauteils nach dem Oberbegriff von Patentanspruch 1 sowie ein nach diesem Verfahren hergestelltes Bauteil gemäß dem Oberbegriff von Patentanspruch 8.The The invention relates to a method for producing a press-hardened component according to the preamble of claim 1 and after this Process manufactured component according to the preamble of claim 8th.
Aus
der gattungsbildenden
Soll nun ein Bauteil aus einem höherfesten Stahlwerkstoff hergestellt werden, so wird bei diesem und ähnlichen Verfahren ein großer Teil der endgültig zu realisierenden Verformung durch die vorgeschaltete Kaltumformung erreicht.Should now a component made of a high-strength steel material are made in this and similar processes a large part the final too realizing deformation by the upstream cold forming reached.
Dabei sollen im Folgenden solche Werkstoffe betrachtet werden, die vor dem Härten als höherfest bezeichnet werden mit einer Zugfestigkeit im Bereich von 400–500 N/mm^2. Das nach der Warmumformung und anschließender Aushärtung erlangte Bauteil wird dann als höchstfest oder ultrahochfest bezeichnet.there In the following, such materials are to be considered as those before the hardening as higher strength be designated with a tensile strength in the range of 400-500 N / mm ^ 2. The component obtained after hot working and subsequent hardening becomes then as supreme or ultra high-strength.
Der Erfindung liegt die Aufgabe zugrunde, ein Presshärteverfahren für Bauteile aus höherfestem Stahl vorzuschlagen, bei dem die benötigte Verformung des Bauteils in einem Umformschritt realisiert werden kann.Of the Invention is based on the object, a press hardening process for components made of higher strength Suggest steel, in which the required deformation of the component can be realized in a forming step.
Die Aufgabe wird erfindungsgemäß durch die Merkmale der Ansprüche 1 und 8 gelöst.The The object is achieved by the Features of the claims 1 and 8 solved.
Danach ist die Umformgeschwindigkeit, mit welcher das Halbzeug im Warmumformwerkzeug umgeformt wird, so hoch, dass der Umwandlungsprozess von einem austenitischen in ein martensitisches oder bainitisches Gefüge erst nach Beendigung des Umformvorgangs abgeschlossen ist (Anspruch 1).After that is the forming speed at which the semi-finished product is formed in the hot-forming tool is so high that the transformation process of an austenitic into a martensitic or bainitic structure only after the termination of the Forming process is complete (claim 1).
Die im Vergleich zur Geschwindigkeit des Gefügeumwandlungsprozesses höhere Umformgeschwindigkeit gestattet es, die gesamte Umformung des aus hochfesten Stahl-Werkstoffen bestehenden Halbzeugs zu komplexen Bauteilen einzig und allein auf eine Warmumformung des Halbzeugs zu beschränken, welche in einem einzigen Hub bewerkstelligt wird. Hierbei können ohne weiteres auch hohe Ziehtiefen prozesssicher realisiert werden. Durch den Entfall vorangehender Kaltumformoperationen, die bei bisher bekannten Presshärteverfahren üblich sind, können die Kosten und der apparative Aufwand für die Fertigung im Vergleich zum gattungsgemäßen Verfahren entscheidend gesenkt werden. Zudem können mit diesem Verfahren die Taktzeiten in der Fertigung verkürzt werden.The higher forming speed compared to the speed of the structural transformation process allows the entire transformation of the semi-finished product made of high-strength steel materials to complex components solely on hot forming of the semifinished product, which is done in a single stroke. Here you can without further high drawing depths can be reliably realized. By the Abolition of previous cold forming operations, which in previously known Press hardening methods are common, can the costs and the equipment required for the production in comparison to the generic method be lowered decisively. In addition, with this method, the Cycle times in production shortened become.
Vorteilhafterweise liegt die Umformgeschwindigkeit im Bereich oberhalb von 65 mm/s. Damit liegt sie oberhalb der Umformgeschwindigkeiten, die mit Hilfe bisher zum Presshärten eingesetzter industrieller Pressen realisierbar sind (Anspruch 2).advantageously, the forming speed is in the range above 65 mm / s. So it is above the forming speeds, with the help previously for press hardening used industrial presses are feasible (claim 2).
Besonders vorteilhaft liegt die Umformgeschwindigkeit oberhalb von 150 mm/s. Bewegt sich die Umformgeschwindigkeit in diesem Bereich, kann der Effekt der noch nicht abgeschlossenen Gefügeumwandlung mit einem guten Kosten-/Nutzenverhältnis genutzt werden, und die durch das Verfahren erreichbare Ziehtiefe kann stark erhöht werden (Anspruch 3).Especially Advantageously, the forming speed is above 150 mm / s. If the forming speed is in this range, the Effect of the unfinished microstructure transformation with a good one Cost / benefit ratio be used, and the achievable by the method drawing depth can be greatly increased be (claim 3).
Bei einer weiteren besonders bevorzugten Weiterbildung der Erfindung liegt die Umformgeschwindigkeit oberhalb von 300 mm/s. Mit einer derartigen Geschwindigkeit können auch hochkomplexe Bauteile aus höherfesten Stahlwerkstoffen, die sonst praktisch nicht umformbar sind, in gewünschter Weise hergestellt werden (Anspruch 4).at a further particularly preferred embodiment of the invention the forming speed is above 300 mm / s. With a such speed can Also highly complex components made of higher-strength Steel materials that are otherwise virtually non-deformable, in the desired Be prepared manner (claim 4).
In einer günstigen Ausgestaltung wird das Bauteil nur bereichsweise gehärtet. So können auch Bauteile mit lokalen Verstärkungen und benachbarten ungehärteten Bereichen durch das Verfahren einfach hergestellt werden (Anspruch 5).In a cheap one Design, the component is only partially cured. So can also components with local reinforcements and neighboring uncured Areas are easily produced by the process (claim 5).
Vorteilhafterweise erfolgt die Erwärmung des Halbzeugs in einem Durchlaufofen. Auf diese Weise kann das Verfahren in der Serienfertigung eingesetzt werden, da mehrere Halbzeuge parallel erhitzt werden können (Anspruch 6).advantageously, the heating takes place of the semi-finished product in a continuous furnace. That way, the process can be used in series production, as several semi-finished products in parallel can be heated (Claim 6).
Es ist günstig, wenn die Warmumformung in einer Hochgeschwindigkeitspresse durchgeführt wird. So können die benötigten hohen Umformgeschwindigkeiten erreicht und die Vorteile der schnellen Umformung voll genutzt werden (Anspruch 7).It is cheap, when hot forming is performed in a high speed press. So can The necessities achieved high forming speeds and the advantages of fast Forming fully utilized (claim 7).
Weiterhin wird ein pressgehärtetes Bauteil aus einem Halbzeug aus ungehärtetem, warmumformbaren Stahl vorgeschlagen, welches nach einem Verfahren nach einem der Ansprüche 1 bis 7 hergestellt ist (Anspruch 8).Farther becomes a press-hardened Component of a semi-finished product made of unhardened, heat-transformable steel proposed, which according to a method according to one of claims 1 to 7 is produced (claim 8).
Vorteilhafterweise besteht das Bauteil aus einem höherfesten Stahlwerkstoff, insbesondere aus dem Werkstoff 22MnB5. Bei diesen Werkstoffen treten die Vorteile des Verfahrens voll in Erscheinung, weil sie bei den gattungsgemäßen niedrigen Umformgeschwindigkeiten ab einer bestimmten Ziehtiefe einer vorausgehenden Kaltumformung unterzogen werden müssten (Anspruch 9 und 10).Advantageously, the component consists of a high-strength steel material, in particular of the material 22MnB5. In these materials, the advantages of the process are fully apparent, because they in the generic low Um Form speeds should be subjected from a certain drawing depth of a previous cold forming (claim 9 and 10).
In einer vorteilhaften Ausgestaltung weist das Bauteil eine Beschichtung zum Korrosionsschutz auf, insbesondere eine Beschichtung aus einem Aluminium-Silizium-Werkstoff. Bei Bauteilen mit einer solchen Beschichtung ist das bekannte Verfahren in der Form gar nicht durchführbar, da die Beschichtung beim Kaltumformen, beispielsweise beim Tiefziehen, teilweise beschädigt würde und in einem weiteren Schritt erneuert werden müsste, was den Aufwand noch einmal deutlich erhöht (Anspruch 11 und 12).In In an advantageous embodiment, the component has a coating for corrosion protection, in particular a coating of a Aluminum-silicon material. For components with such a coating the known method in the form is not feasible because the coating during cold forming, for example, during deep drawing, partially damaged would and would have to be renewed in a further step, what the effort yet once significantly increased (Claim 11 and 12).
Weitere Ausgestaltungen und Vorteile der Erfindung gehen aus der Beschreibung hervor. Die Erfindung ist in den Zeichnungen anhand mehrerer Ausführungsbeispiele ausführlich erläutert.Further Embodiments and advantages of the invention will become apparent from the description out. The invention is illustrated in the drawings with reference to several embodiments in detail explained.
Dabei zeigen:there demonstrate:
Der
erhitzte Rohling wird dann mit Hilfe eines Manipulators
Wird
dieses gattungsgemäße Verfahren
nun mit einem Stahlblech
Einen
Ausweg stellt das in
Das
Halbzeug
Das
Halbzeug
Nun
wird das Halbzeug
Dieser
Aushärteprozess
des Bauteils
Nach
der Warmumformung wird das fertige Bauteil
Das
Verfahren nach
In
Unterschiedliche
Kurven
Über alle
diese variierten Parameter ist der Effekt deutlich zu sehen, dass
eine umso größere Ziehtiefe
Zusammenfassend
lässt sich über die
Umformgeschwindigkeit
Neben
der dargestellten Abhängigkeit
der Ziehtiefe
Durch
das Verfahren sind vor allem solche Bauteile
Das
Verfahren sowie das durch das Verfahren hergestellte Bauteil
Claims (12)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510041741 DE102005041741B4 (en) | 2005-09-02 | 2005-09-02 | Method for producing a press-hardened component |
PCT/EP2006/007917 WO2007028475A2 (en) | 2005-09-02 | 2006-08-10 | Method for producing press-hardened component |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200510041741 DE102005041741B4 (en) | 2005-09-02 | 2005-09-02 | Method for producing a press-hardened component |
Publications (2)
Publication Number | Publication Date |
---|---|
DE102005041741A1 true DE102005041741A1 (en) | 2007-03-08 |
DE102005041741B4 DE102005041741B4 (en) | 2010-03-18 |
Family
ID=37421079
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200510041741 Revoked DE102005041741B4 (en) | 2005-09-02 | 2005-09-02 | Method for producing a press-hardened component |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE102005041741B4 (en) |
WO (1) | WO2007028475A2 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009116005A1 (en) * | 2008-03-21 | 2009-09-24 | Oreiller, Mariella | Method and machine for manufacturing spring-guide sections |
DE102009012940A1 (en) | 2009-03-12 | 2010-09-16 | Volkswagen Ag | Producing a sheet metal component, comprises trimming and/or deforming a workpiece, and partially heating and definingly cooling the workpiece in a cooling tool by placing cooling tool elements on a surface of the workpiece |
DE102009050997A1 (en) | 2009-10-28 | 2011-05-12 | Volkswagen Ag | Method for producing a form-hardened component made of a steel-plate, comprises heating a board tailored on given dimensions in an oven within a given time at a given temperature and then form-hardening in a tool |
DE102010007955A1 (en) * | 2010-02-12 | 2011-08-18 | Johnson Controls GmbH, 51399 | Method for producing high-strength components by means of adiabatic punching |
DE102010055148A1 (en) | 2010-12-18 | 2012-06-21 | Tu Bergakademie Freiberg | Manufacturing form-hardened component, preferably vehicle body component, comprises heating a board of steel in a heating plant to a temperature above the austenitizing temperature of steel, and form curing in a tool |
DE102011010401A1 (en) * | 2011-02-04 | 2012-08-23 | Oerlikon Trading Ag, Trübbach | Cr-Si-N coated tools for forming or punching hot metal plates |
DE102016100589A1 (en) * | 2016-01-14 | 2017-07-20 | Voestalpine Metal Forming Gmbh | Method and apparatus for thermoforming steel sheets |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007057855B3 (en) | 2007-11-29 | 2008-10-30 | Benteler Automobiltechnik Gmbh | Production of moldings with structure zones of different ductility comprises heat treatment of aluminum-silicon coated high-tensile steel blank, followed by treating zones at different temperature |
KR100902857B1 (en) * | 2008-10-16 | 2009-06-16 | 현대하이스코 주식회사 | Method for manufacturing ultra high strength steel parts |
CN111434404B (en) * | 2019-05-27 | 2022-03-25 | 苏州普热斯勒先进成型技术有限公司 | Method and device for manufacturing corrosion-resistant hot stamping part |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2452486C2 (en) * | 1973-11-06 | 1985-10-17 | Plannja AB, Luleå | Process for press forming and hardening a steel sheet with a small material thickness and good dimensional accuracy |
DE19723655A1 (en) * | 1996-06-07 | 1997-12-11 | Ssab Hardtech Ab | Process for the production of sheet steel products |
DE19815022A1 (en) * | 1998-04-03 | 1999-10-21 | Daimler Chrysler Ag | Drawn parts made of spring steel sheet, especially as a lightweight or body part |
DE10254695B3 (en) * | 2002-09-13 | 2004-04-15 | Daimlerchrysler Ag | Production of a metallic component, especially a vehicle body component, from a semifinished product made of non-hardened heat-deformable sheet steel comprises cold-forming, trimming, hot-forming and press-hardening processes |
WO2005021821A1 (en) * | 2003-07-29 | 2005-03-10 | Voestalpine Stahl Gmbh | Method for producing hardened parts from sheet steel |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2787735B1 (en) * | 1998-12-24 | 2001-02-02 | Lorraine Laminage | PROCESS FOR PRODUCING A WORKPIECE FROM A STRIP OF ROLLED STEEL SHEET AND ESPECIALLY HOT ROLLED |
KR100420535B1 (en) * | 2000-08-08 | 2004-03-02 | (주)새터 엔지니어링 | Press-Hardening Process using boron-added Low carbon steel |
DE10120919A1 (en) * | 2001-04-27 | 2002-10-31 | Benteler Automobiltechnik Gmbh | Process for producing a hardened sheet metal profile |
JP3738754B2 (en) * | 2002-07-11 | 2006-01-25 | 日産自動車株式会社 | Aluminum plating structural member for electrodeposition coating and manufacturing method thereof |
DE102004007071B4 (en) * | 2004-02-13 | 2006-01-05 | Audi Ag | Method for producing a component by forming a circuit board and apparatus for carrying out the method |
-
2005
- 2005-09-02 DE DE200510041741 patent/DE102005041741B4/en not_active Revoked
-
2006
- 2006-08-10 WO PCT/EP2006/007917 patent/WO2007028475A2/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2452486C2 (en) * | 1973-11-06 | 1985-10-17 | Plannja AB, Luleå | Process for press forming and hardening a steel sheet with a small material thickness and good dimensional accuracy |
DE19723655A1 (en) * | 1996-06-07 | 1997-12-11 | Ssab Hardtech Ab | Process for the production of sheet steel products |
DE19815022A1 (en) * | 1998-04-03 | 1999-10-21 | Daimler Chrysler Ag | Drawn parts made of spring steel sheet, especially as a lightweight or body part |
DE10254695B3 (en) * | 2002-09-13 | 2004-04-15 | Daimlerchrysler Ag | Production of a metallic component, especially a vehicle body component, from a semifinished product made of non-hardened heat-deformable sheet steel comprises cold-forming, trimming, hot-forming and press-hardening processes |
WO2005021821A1 (en) * | 2003-07-29 | 2005-03-10 | Voestalpine Stahl Gmbh | Method for producing hardened parts from sheet steel |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009116005A1 (en) * | 2008-03-21 | 2009-09-24 | Oreiller, Mariella | Method and machine for manufacturing spring-guide sections |
DE102009012940A1 (en) | 2009-03-12 | 2010-09-16 | Volkswagen Ag | Producing a sheet metal component, comprises trimming and/or deforming a workpiece, and partially heating and definingly cooling the workpiece in a cooling tool by placing cooling tool elements on a surface of the workpiece |
DE102009012940B4 (en) * | 2009-03-12 | 2017-12-07 | Volkswagen Ag | Method for producing a component, in particular a sheet-metal component, and production line for producing the component |
DE102009050997A1 (en) | 2009-10-28 | 2011-05-12 | Volkswagen Ag | Method for producing a form-hardened component made of a steel-plate, comprises heating a board tailored on given dimensions in an oven within a given time at a given temperature and then form-hardening in a tool |
DE102009050997B4 (en) * | 2009-10-28 | 2017-07-13 | Volkswagen Ag | Method and forming device for producing a form-hardened component |
DE102010007955A1 (en) * | 2010-02-12 | 2011-08-18 | Johnson Controls GmbH, 51399 | Method for producing high-strength components by means of adiabatic punching |
DE102010055148A1 (en) | 2010-12-18 | 2012-06-21 | Tu Bergakademie Freiberg | Manufacturing form-hardened component, preferably vehicle body component, comprises heating a board of steel in a heating plant to a temperature above the austenitizing temperature of steel, and form curing in a tool |
DE102010055148B4 (en) * | 2010-12-18 | 2016-10-27 | Tu Bergakademie Freiberg | Process for the production of form-hardened components |
DE102011010401A1 (en) * | 2011-02-04 | 2012-08-23 | Oerlikon Trading Ag, Trübbach | Cr-Si-N coated tools for forming or punching hot metal plates |
DE102016100589A1 (en) * | 2016-01-14 | 2017-07-20 | Voestalpine Metal Forming Gmbh | Method and apparatus for thermoforming steel sheets |
Also Published As
Publication number | Publication date |
---|---|
WO2007028475A3 (en) | 2008-07-17 |
WO2007028475A2 (en) | 2007-03-15 |
DE102005041741B4 (en) | 2010-03-18 |
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Legal Events
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OP8 | Request for examination as to paragraph 44 patent law | ||
8127 | New person/name/address of the applicant |
Owner name: DAIMLERCHRYSLER AG, 70327 STUTTGART, DE |
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